Building-slab.



A WHITE.

BUILDING SLAB.

APPLICATION FILED JAN.23,1911.

1,617,067, Patented Feb. 13, 1912.

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To all whom it may concern:

Be it known that I, ARTHUR WVHITE, a citizen of the United States, residing in Sheboygan Falls, in the county of Sheboygan and State of Wisconsin, have invented new and useful Improvements in Building- Slabs, of which the following is a description, ref erence being had to the accompanying drawings, which are a part of this specification.

This invention relates to improvements in building slabs and more particularly to that class of slabs in which floors, roofs and other portions of a building are formed of slabs or sections of material formed of cementitious material.

It is one of the objects of this invention to provide a building slab formed of a plurality of parts which when interlocked together form a slab having air spaces therebetween and also having means for breaking the joints when several sections are assembled together.

A further object of the invention is to provide a building slab formed of cementitious material which has comparatively thin walls and is strong and durable and which may be easily molded.

A further object of the invention is to provide a building slab formed of cementitious material which is adapted to be reinforced with bent metal rods embedded therein, if desired.

WVith the above, and other objects in view, the invention consists of the improved building slab and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in the several views, Figure 1 is a perspective view of two of the slabs cemented together as used in a building; Fig. 2 is a perspective view of a modified form of slab showing the lower half thereof; Fig. 3 is a similar view of the upper half thereof; Fig. 4 is a transverse sectional view of the assembled parts of the modified form; Fig. 5 is a transverse sectional detail View of another modified form; and Fig. 6 is a transverse sectional detail view of still another modified form.

Referring to the drawing the numeral 8 indicates the upper half section and 9 the lower half section of the slab which are identical in shape and size and are placed together with the lower section inverted and Specification of Letters Patent.

Application filed January 23, 1911.

Patented Feb. 13, 1912.

Serial No. 604,102.

turned side for side with portions overlapped to form the complete slab. Each section consists of a channel-shape section having a horizontal base or body portion 10, a right angle vertical flange 11 and a stepped flange 12 which extend along the side edges of the body portion 10. The right angle flange projects approximately one half the distance of the height of the completed slab while the stepped flange projects at right angles with relation to the body an equal distance plus the thickness of the material and then extends horizontally as the stepped port-ion 13, a certain distance and thence extends at right angles to the step to form the other part of the vertical portion 14 of the stepped flange 12. An intermediate locking flange 15 projecting medially and longitudinally from the body portion is positioned to engage the locking flange of the other section and lock said sections against lateral movement with relation to each other. When the two sections are cemented together, they form a slab having two air spaces 16 between the sections and a rabbet edge 17 along each side edge of the slab adapted to overlap the rabbet edges of adjacent slabs and form rabbet joints between the slabs. In joining the sectionsand also the slabs together in erecting a building, cement or mortar 19 is placed between the joints to bind the parts together.

In the modified form shown in Figs. 2, 3 and 4c the base portion 20 of each section is provided with flanges 21 projecting on all four side edges which are adapted to be overlapped by similar flanges of the other section thus forming a box like structure. This form of slab is provided with intermediate overlapping flanges or partitions 22 to strengthen the sections and also to form a plurality of air chambers 23. The flanges of both forms of slabs may be reinforced with metal rod as indicated by the numeral 24 if desired to further strengthen the slabs.

The sections of the modified form shown in Fig. 5 are provided with dovetail recesses 25 which are adapted to be filled with cement or other material 26 to bind. the parts together. The adjacent faces of portions of the sections may, if desired, be roughened as indicated by the numeral 27 to cause the cement or other material to adhere more closely thereto.

In the modified form shown in Fig. 6 the sections are provided with a tongue and groove construction 28 extending longitudinally along the rabbet joint thereof to bind the slabs together and space is pro vided between the sections to accommodate cement or other material.

From the foregoing description it will be seen that a building slab formed of sections is provided which may be easily and inexpensively molded and when formed, is

strong and durable and contains but a minimum amount of material and is comparatively light in weight. The slabs When joined together in a building form a structure in which the novel arrangement of the rabbet oint provide for breaking said joints with air spaces so that cold, heat or moisture cannot penetrate in a direct line from one side of slab structure to the other.

It is obvious that any or all of the flanges may be strengthened with reinforcing metal if desired, or modified in many ways and I therefore desire it to be understood that this invention is not limited to any specific form or arrangement of parts except in so far as such limitations are specified in the claims.

What I claim as my invention is:

1. A building slab, comprising similar sections of cementitious material having side flanged portions and stepped flanged portions and intermediate flanges which overlap each other and form a slab with an air space therebetween when one of the sec tio-ns is inverted and reversed side for side with relation to the other section, said slab having opposite side stepped portions.

2. A building slab section, consisting of an elongated body part of cementitious material having a flange projecting at right angles from one side edge thereof and a 40 stepped flange projecting from the opposite side edge, the step of said step flange eX- tendin in a plane'parallel to the plane of the bocy portion, and a flange projecting at right angles from the body portion intermediate of the other flanges.

3. A building slab, comprising similar sections of cementitious material having flanged portions and stepped flanged portions which overlap each other and form a slab with an air space therebetween when one of the sections is inverted and reversed side for side with relation to the other section, said flanges and stepped flanges positioned to overlap similar parts of adjacent sections to form rabbet joints located between the air spaces of adjacent sections, and means provided for bin ding the sections and the slabs together.

4. A building slab, comprising similar sections of cementitious material having flanged portions and stepped flanged portions which overlap each other and form a slab with an air space therebetween when one of the sections is inverted and reversed side for side with relation to the other sec- ARTHUR WHITE. Witnesses C. H. KEENEY, W. F. MOOAUGHEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

